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The Theory of Planned Behaviour as Predictor of Exercise

The Moderating Influence of Beliefs and Personality Variables

Department of Experimental Psychology, University of Bristol, UK

Paul Bennett

Division of General Practice, University of Wales College of Medicine, Cardiff, UK

In a test of the predictive utility of the theory of planned behaviour alone and in conjunction with a number of additional variables, 114 participants completed questionnaires measuring predictor variables and, three weeks later, reported exercise. The results of the present study provide partial support for the theory. Past behaviour was the most predictive variable. Subjective norm was not a significant predictor of intention to exercise. Attitude towards exercise was also not a predictor of exercise intention. Self-monitoring acted as a moderator of the attitude–intention relationship. Perceived behavioural control was not a significant predictor of exercise behaviour, while exercise intentions were only weak predictors. The results also suggested that perceived behavioural control and perceived barriers are not equivalent, and should be treated as separate variables that contribute independently to the predictive ability of the model. The implications of the findings are discussed.

Key Words: exercise • role identity • self-monitoring • theory of planned behaviour

Journal of Health Psychology, Vol. 4, No. 4, 517-529 (1999)
DOI: 10.1177/135910539900400406


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